IATA airport code
From Wikinfo
The IATA airport code is a three-letter alphanumeric code designating each airport around the world. These codes are defined by the IATA organization of travel agents.
The codes are not quite unique: 323 of these approximately 20,000 codes are used by more than one airport.
The characters prominently displayed on baggage tags attached at airport check-in desks are an example of a way these codes are used.
While the IATA codes are the most familiar airport codes, the 4-letter ICAO airport codes are also common.
A list of airports, sorted by IATA code, is available. Also, a List of Rail Stations codeshared in agreements between airlines and rail lines such as Amtrak, SNCF French Rail, Deutsche Bahn, Thalys International, and Swiss Rail is available.
References
- Adapted from the Wikipedia article, "IATA_airport_code" http://en.wikipedia.org/wiki/IATA_airport_code, used under the GNU Free Documentation License
